Configuring Large Replication Topologies

In particularly large topologies, it is often simpler to configure dedicated replication servers (servers that do not include a directory server) and dedicated directory servers (servers that do not included a replication server).

A dedicated directory server contains replicated data but does not contain a change log with the modifications made to that replicated data. A dedicated directory server also has no configured replication port. A dedicated replication server has a configured replication port. The server does not contain replicated data but does contain a change log with the modifications made to the replicated data on other servers in the topology.

Note - Each topology must have at least two replication servers to avoid a single point of failure.

For more information and sample topologies, see Chapter 5, Example Deployments Using the Directory Server, in Sun OpenDS Standard Edition 2.2 Deployment Planning Guide.

The following diagram illustrates a large replication topology with one dedicated replication server (Replication Server 2), four dedicated directory servers, and one servers that contains both a replication and a directory server (Host 1).

Figure shows a large replicated topology with dedicated replication and directory servers

To Configure a Dedicated Directory Server

To configure a dedicated directory server, use the --noReplicationServer1 or --noReplicationServer2 option when you enable replication between two directory servers. This example configures replication between the directory server instances A and B in the previous illustration.

$ dsreplication enable \
  --host1 host1 --port1 4444 --bindDN1 "cn=Directory Manager" \
  --bindPassword1 password --replicationPort1 8989 \
  --host2 host2 --port2 4444 --bindDN2 "cn=Directory Manager" \
  --bindPassword2 password  --noReplicationServer2 \
  --adminUID admin --adminPassword password --baseDN "dc=example,dc=com" -X -n

To Configure a Dedicated Replication Server

To configure a dedicated replication server, use the --onlyReplicationServer1 or --onlyReplicationServer2 option when you enable replication between two servers. This example configures replication between Directory Server C and Replication Server 2 in the previous illustration.

$ dsreplication enable \
  --host1 host3 --port1 4444 --bindDN1 "cn=Directory Manager" \
  --bindPassword1 password --noReplicationServer1 \
  --host2 host4 --port2 4444 --bindDN2 "cn=Directory Manager" \
  --bindPassword2 password --onlyReplicationServer2 \
  --replicationPort2 8989 --adminUID admin --adminPassword password \
  --baseDN "dc=example,dc=com" -X -n

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Sun OpenDS Standard Edition 2.2 Administration Guide